This sound level meter's accurate data can be easily transferred to a PC from its RS232 interface and analyzed with its included software. It measures levels in the 30 to 130dB range with A/C frequency weighting and fast/slow response. The 'A' frequency matches that of the human ear and is best for environmental and hearing conservation programs. The 'C' frequency is a flatter response, best for analysis of machine, engines, etc. The FAST response time can be used to capture sudden noise, while the SLOW response time is best for consistent noise levels. The large LCD display includes function display and a fast 50 segment bar display. All data is logged with a time and date stamp. Every time the meter is powered on, it performs an internal self-test to ensure the most constant accurate readings. The meter requires the use of four AA batteries, included.